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Finding the Fourth Proportional to 2,170, 3,255.76 and 709.16

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Solution

The fourth proportional to 2,170, 3,255.76 and 709.16 is: 1,063.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,170 : 3,255.76 = 709.16 : x
  2. Step 2: Convert to fraction form
    2,170/3,255.76 = 709.16/x
  3. Step 3: Cross multiply
    2,170x = 3,255.76 × 709.16
  4. Step 4: Simplify right side
    2,170x = 2,308,854.76
  5. Step 5: Solve for x
    x = 2,308,854.76/2,170
  6. Step 6: Final answer
    x = 1,063.99

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.